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page_pool: add DMA-sync-for-CPU inline helper
Each driver is responsible for syncing buffers written by HW for CPU before accessing them. Almost each PP-enabled driver uses the same pattern, which could be shorthanded into a static inline to make driver code a little bit more compact. Introduce a simple helper which performs DMA synchronization for the size passed from the driver. It can be used even when the pool doesn't manage DMA-syncs-for-device, just make sure the page has a correct DMA address set via page_pool_set_dma_addr(). Signed-off-by: Alexander Lobakin <aleksander.lobakin@intel.com> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
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@ -52,6 +52,8 @@
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#ifndef _NET_PAGE_POOL_HELPERS_H
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#define _NET_PAGE_POOL_HELPERS_H
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#include <linux/dma-mapping.h>
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#include <net/page_pool/types.h>
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#ifdef CONFIG_PAGE_POOL_STATS
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@ -395,6 +397,28 @@ static inline bool page_pool_set_dma_addr(struct page *page, dma_addr_t addr)
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return false;
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}
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/**
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* page_pool_dma_sync_for_cpu - sync Rx page for CPU after it's written by HW
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* @pool: &page_pool the @page belongs to
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* @page: page to sync
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* @offset: offset from page start to "hard" start if using PP frags
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* @dma_sync_size: size of the data written to the page
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*
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* Can be used as a shorthand to sync Rx pages before accessing them in the
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* driver. Caller must ensure the pool was created with ``PP_FLAG_DMA_MAP``.
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* Note that this version performs DMA sync unconditionally, even if the
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* associated PP doesn't perform sync-for-device.
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*/
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static inline void page_pool_dma_sync_for_cpu(const struct page_pool *pool,
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const struct page *page,
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u32 offset, u32 dma_sync_size)
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{
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dma_sync_single_range_for_cpu(pool->p.dev,
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page_pool_get_dma_addr(page),
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offset + pool->p.offset, dma_sync_size,
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page_pool_get_dma_dir(pool));
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}
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static inline bool page_pool_put(struct page_pool *pool)
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{
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return refcount_dec_and_test(&pool->user_cnt);
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